X0306 4 2018-05-15 0001723596 Columbia Financial, Inc. CLBK 0001731395 Massood Michael Jr. 19-01 ROUTE 208 NORTH FAIR LAWN NJ 07410 1 Common Stock 2018-05-15 4 P 0 7000.0000 16.3700 A 21554.0000 I By IRA Common Stock 2018-05-16 4 P 0 3417.0000 17.0000 A 24971.0000 I By IRA Common Stock 2018-05-16 4 P 0 1803.0000 16.9900 A 26774.0000 I By IRA Common Stock 2018-05-15 4 P 0 4000.0000 16.3500 A 11265.0000 I By Roth IRA Common Stock 2018-05-16 4 P 0 216.0000 16.9900 A 11481.0000 I By Roth IRA The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $16.34 to $16.40, inclusive. The reporting person undertakes to provide to Columbia Financial, Inc., any security holder of Columbia Financial, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares at each separate price within the ranges set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $16.34 to $16.37, inclusive. The reporting person undertakes to provide to Columbia Financial, Inc., any security holder of Columbia Financial, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares at each separate price within the ranges set forth in this footnote. /s/ Christina M. Gattuso, Power of Attorney 2018-05-17